Saw-tooth wrench.



G. H. SHELLABERGER.

SAW TOOTH WRENCH.

(Application filed Apr.'7, 1902.)

(No Modgl.) 2 Sheets-Sheet I.

No. 705,454. Patented July 22, I902.

w: NORRIS PETERS gm, PHOTO-LIYHQ, WASHINGTON. n. c.

No. 705,454. Patented July 22, I902.

, G. H. SHELLABERGEH.

SAW TOOTH WRENCH. (Application filed Apr. 7, 1902.) (No Model.) 2 SheetsSheet 2.

UN-ITEDI' STATES" PATENT OFFICE.

I GEORGE H. SHELLABERGER, OF BARTOW, FLORIDA.

SAW-TOOTH WRENCH.

SPECIFICATION formingpart of Letters Patent No. 705,454, dated July 22, 1902. Application filed April '7, 1902. Serial No. 101,789. (No model.)

To all Hill /077? it may concern:

Be it'known that I, GEORGE H. SHELLA- BERGER, a citizen of the United States, resid ing at Bartow, in the county of Polk and State of Florida, have invented certain new and useful Improvements in Saw Tooth Wrenches, of which the following is a specification. Y

My invention relates to Wrenches, and more particularly to that class of wrenches which are employed in withdrawing removable sawteeth from the cutting edges of circular and other saws. In many forms of power-operated saws, and more especially those of the circular type, the cutting members or teeth thereof are made separable and removable for purposes of sharpening the same when they become dull and replacing old and Wornout teeth by new ones. The act of removing and reinserting these teeth in their seats in i the margin of the saw blade or disk has heretofore been accompanied by considerable danger and risk to the operator, owing to the fact that the tools hitherto employed in applying and. removing these saw-teeth have, so far as I am aware, been unprovided with means for securing the tool to the tooth beyond all possible danger of a slip of the tool off the tooth when the power is applied by the hand of the operator, and hence great care hashad to be exercised by the operator in manipulating the tool lest his hand should accidentally be thrust in contact with the sharp teeth of the saw,with the resulting on tting and lacerating of that member that inevitably follows such a mismovement.

The primary object of my invention is to produce a wrench specially'adapted for the application and removal of saw-teeth possessing such a construction and mode of manipulation as to secure a hold upon the tooth which is proof against accidental slip or displacement, and thus entirely obviate the dangers above referredto.

Another object of the invention. is to produce a wrench of the character specified whichshall be capable of use in connection with teeth ofvarying forms andsizes. Other minor objects of the invention will appear later in the following description.

To these ends my invention consists in a saw tooth wrench possessing the peculiar characteristics of structure and mode of manipulationsubstantially as hereinafter described, and more particularly pointed out in plied to a saw-tooth for the removal of the 'detail transverse sectional View on the line 7 7 of Fig. 5, illustrating the manner in which the tooth is seated in the saw-disk.

In the drawings, 8 designates the disk of a circular saw mounted upon a driving shaft or arbor 9. The peripheral margin of this disk is provided at regular intervals with a series of shallow curved notches 10, con'sti-' tuting seats for the removable saw-teeth l1 and their shanks 12. These seats are formed for the greater part upon arcs of circles; but the upwardlyextending end of each seat which is oppositeto the saw-tooth proper and which engages the rear end or heel of the shank 12 is given an inward turn 06 from the arc cf the circle, so as to constitute in association with said tooth-shank a stop or abutment having a wedge-like form and action. As shown in Fig. 7, the cut-out concave'margin of the seat is beveled on both sides, thereby providing throughout the entire extent of the seat a longitudinally-extending V-shaped ridge or tenon S, whichis adapted to snugly fit and cooperate witha corresponding peripheral groove 12*, formed in the cooperating convex margins of the'removable teeth an their shanks.

Fig. 5is a similar view illustrating a "too described and fitting in and cooperating with the margin of the saw-disk in the manner set forth and shown are old and well known in the art of power-saws. For the purposes of inserting and removing the teeth 11 and their holders or shanks 12 the latter are commonly provided with one or more openings formed transversely through the shank-section of the tooth. In Figs. 3 and 6 I have shown a tooth the shank whereof is provided with a pair of transverse holes 13 and 14, located, respectively, adjacent the forward and rear ends of the shank. In Figs. 4, 5, and 6 I have shown a similar but slightly smaller form of toothshank provided with but the single hole 13, formed therethrough near its forward end. My invention is equally well adapted to co operate with either form of tooth-shank, as well as with teeth wherein the holes 13 and 14 are located at varying distances apart.

Referring now to the construction of my improved wrench, which has been especially designed for cooperation with removable sawteeth of the character hereinabove referred to, 15 designates the head of the wrench, which is constituted by a flat metal plate of considerable thickness, as shown in Fig. 2, and having an irregular outline, preferably of the general form illustrated in Fig. 1. For purposes of convenient description I refer to the several parts or sections of the wrench-head 15 as consisting of a nose 15, a back 15", and a heel 15. The nose 15 is transversely apertured by an internallythreaded hole to receive and seat a pin 16, that portion of the pin engaging the threaded aperture referred to being externally threaded and the pin having fast on the outer end thereof a head in the form of a nut 16, whereby it may readily be screwed into place. The back portion 15 of the wrench-head is provided with an integral lateral boss 17, the back and boss being transversely apertured to receive a bolt 18, passed therethrough, which bolt is provided on one end with a square head 19 and a removable washer 20 and at its other end is externally threaded to receive a binding-nut 21.

To the outer face of the boss 17 is applied the lower end of the wrench-shank 22, which latter is herein shown as comprising simply a straight fiat metal bar of uniform width and thickness throughout. The extreme lower end of the bar 22 is provided with a notch of a suitable size to engage the pin 16 in the manner clearly shown in Fig. 4. It will be noticed that this notch has a mouth 23, formed of a unform width just sufficient to embrace the bolt 16, while in rear thereof the notch is given a circular formation, as shown at 24, of

over to the extent permitted by the length of the slot. In practice this slot is made long enough to facilitate the ready application and withdrawal of the notch 24 to and from the forward bolt 16 in the act of applying the wrench to and removing it from a tooth. The rear or heel portion 15 0f the wrench-head is provided with a slot 26, extending longitudinally thereof, which slot on that side of the head which is adjacent the bar 22 is countersunk on the sides thereof to about one-half the depth thereof, as shown at 27. Through this slot is passed a pin 28 similar to the pin 16, the pin 28 being confined in the slot with freedom for adjustment to any desired position longitudinally thereof by means of a pair of nuts 29 and 30, the former of which engages the outer end of the pin and the adjacent outer face of the wrench-head, while the inner nut 30 has a sliding fit within the countersunk side of the slot 26. By applying an ordinary Wrench to the outer nut 29 the same may be loosened to set the pin 28 at any desired position, after which by turning 11p the nut 29 the pin is rendered rigid relatively to the wrench-head.

The operation of the hereinabove-described wrench and its manner of application to a saw-tooth to be inserted or removed thereby is substantially as follows: Referring to Figs. 1, 2, and 3, the head of the wrench is applied to one side of the tooth, and the pin 28 is adjusted and secured in such a position that the two pins 16 and 28 will respectively register with and enter the openings 13 and 14 in the shank member of the tooth, the arm 22 being retracted to enable the adjacent faces of the wrench-head and of the tooth-shank to lie snugly in contact. By reason of the presence of the thickened portion or boss 17 of the wrench-head, which is of substantially the thickness of the saw-tooth and which lies in the same plane as the latter, the lowerjend of the operating-arm 22 is caused to overlie the opposite side of the tooth, and upon then push- ICS ing downwardly and forwardly the said arm the notch 24 in the forward end thereof may be carried over and caused to engage the pin 16 in the manner clearly indicated in Fig. 4, the lower end of the arm thus lying in substantial contact with the inner side of the tooth, opposite to that side which is contacted by the wrench head 15. In this manner the wrench-head and arm are afforded a secure hold upon the shank of the tooth at two separated points therein and on both sides thereof. It will be obvious that by then depressing the outer end or handle of the wrencharm 22 the tooth and its shank will be rocked in their seat in a direction to first expel the tooth member 11 and subsequently withdraw also the shank member 12. In this operation on thepartof the wrench to fly off to one side or the other irrespective of the particular character of the hold of thewrench upon the tooth. The principal fault in devices here: tofore employed for this purpose has been that they engaged the tooth on one side only and to one side of the plane of the tooth, thereby creating a liability of the tool to slip off the toothwhen pressure was applied, often to the serious injury of the operator. When the tooth has been properly sharpened or re-.

placed by a new tooth, the parts may bereplaced in their seat by the converse of these operations, the heel or tail of the shank being first introduced, after which by elevating the outer handle vof the tool the tooth may be forced by the lever action of the latter into secure locking engagement with its seat. This do.ne,the operator first withdraws the arm 22 to the extent indicated in Figs. land 3 and thenremoves the wrench-head laterally from the saw-disk, this operation withdrawing' the pins 16 and 28 from the tooth-shank, thus entirely disengaging the tool.

Wherethe tool is applied to a tooth such as is shown in Fig. 4, having but asingle hole in the forward end of the shank, the pin 28 is adj usted to occupy the inner end of its containing-slot, and in the operation of extracting the tooth the pin 28 bears against the inner concave edge of the shank, constituting therewith a-fixed thrust-pointon which the force applied downwardly to the end of .the handle may bemade effective to rockand slide the tooth out of locking engagement, with its seat. In the converse operation of replacing the tooth inits seat the nose 1750f the boss :abutsthe upper end of the inner curved margin of the tooth-shank'in the man ner shown, constituting therewith a fixed thrust-point on which the force applied upwardly to the end of the handle may bemadeeflfective to rock the toothinwardly into locked engagement with its seat. It will be evident that the wrench is capable of application in this manner to a tooth such as is shown in Fig. t if desired; but where the; tooth-shank is provided with a hole at each end thereof I prefer to engage .both pins therewith for the purpose of obtaining a more 1 rigid and secure hold upon the tooth.

Fig. 5 illustrates a slightly-modified form of wrench-head adapted for cooperation with either the tooth shown in Fig. 3 or that shown in Fig. 4, but more particularly designed for application to the latter form. In this case the boss 17 onthe side of the wrench-head is provided on its under side with a V-shaped point 17, which formation can be easily secured by making the boss substantially triangular in shape, as shown. In the application of this form of wrench to the tooth the point 1'7 bites the inner concave-edge of the tooth-shank, constituting therewith a thrustpoint to render effective the force applied downwardly-to the outer end of the handle, while the forward point or nose 17 of the tri- In the several operations described-itwill be observed that the circular formation of the notch24 in the forward end of the arm 22 in association with the mouth 23 of just, sufficientwidth to pass over the pin 16 alfords a very secure seat .for the pinwhen eithera downward or. upward pressure is applied to the handle of the wrench, the pin being capable of removal from the notchonly bya direct outward pull upon the handle. This practical-interlocking of the pin with the nose of the I operating-arm ofthe tool during those movement-sot thelatter wherein the tooth is being removed or inserted contributes largely to the safetyof the implement for thetvpurpose described.

From the foregoing it will be seen that my an accidental slip thereon, with the injurious consequences often resulting from such insecure hold of the tool on the object to which it is applied. The safety feature of my invention is still further enhanced by the fact that the tool is provided with a comparatively long shank and handle extending at a considerable angle from the underlying line of the saw-teeth, and hence permitting considerable freedom of movement of the hand of the operator without danger of contact with the saw-teeth.

I am ,aware that numerous changes and modifications might be made in the detailfeatures of my invention without altering its.

characterand substance. I do not, therefore, limit myself to the precise formsand relative arrangement of the several cooperating elements herein shown anddescribed, except to thee'xtent that they may be made the-subject of specific claims.

I claim- 7 1. A- saw-tooth wrench, comprising in combination a wrench-head provided with aplurality of tooth-engaging devices thereon, and

an operating-arm connected with saidhead and removably engaging one of said toothengaging devicesonthe opposite side of the 1 ably engaging one of said tooth-engaging devices on thecopposite side of the tooth, substantially as described.

3. A saw-tooth wrench, comprising in combination a wrench-head provided with a pair of tooth-engaging devices at longitudinallyseparated points thereon, and an operatingarm slidably secured to said head and remov ably engaging one of said tooth-engaging devices on the opposite side of the tooth, substantially as described.

4. A saw-tooth wrench, comprising in combination a wrench-head provided with a pair of tooth-engaging devices at longitudinallyseparated points thereon, one of which is adjustable, and an operating-arm slidably secured to said head and removably engaging one of said tooth-engaging devices on the opposite side of the tooth, substantially as described.

5. A saW-tooth wrench, comprising in combination a wrench-head provided with a pair of laterally-extending tooth-engaging pins atlongitudinally-separated points thereon, the foremost of which is fixed and the rearmost of which is adjustable, and an operating-arm slidably secured to said head and adapted to removably engage the foremost of said pins on the opposite side of the tooth, substantially as described.

6. A saw-tooth wrench, comprising in combination a wrench-head provided with a pair of laterally-extending tooth-engaging pins at longitudinally-separated points thereon, and an operating-arm slidably secured to said head and provided with a notch adapted to removably engage one of said tooth-engaging pins on the opposite side of the tooth, substantially as described.

7. A saw-tooth wrench, comprising in combination a wrench-head provided with a pair of laterally-extending tooth-engaging pins at longitudinally-separated points thereon, and an operatingarm slidably secured to said head and provided in its forward end with a notch adapted to removably engage the foremost of said tooth-engaging pins on the opposite side of the tooth, substantially as described.

8. A saw-tooth wrench, comprising in combination a wrench-head provided with a pair of laterally-extending tooth-engaging pins at longitndinally-separated points thereon, the foremost of which is fixed and the rearmost of which is adjustable, and further provided with a third laterally-extending pin located above and between said tooth-engaging pins, and a slotted operating-arm mounted on said last-named pin and provided in its forward end with a notch adapted to removably engage the foremost of said tooth-engaging pins on the opposite side of the tooth, substantially as described.

GEORGE H. SHELLABERGER.

Vitnesses:

A. G. KENNEDY, MARGARET WILTBERGER. 

